I'm sorry everyone, my work is probably full of inconsistents stuff so I will try to explain and just make head and tails from everything. Also this chapter will be updated in the future, so I want readers to say what should I explain, or correct.
Explanation:
Two classes that exist in this world are knights and mages. Mages cast spells, enchant items, create formations etc. Knights are people who use aura. They are stronger, faster and more resistant compared to normal people.
Differences:
Main one is that knights use aura,which is power drawn from their body, and mages use mana which is the power of the world. Aura enchants knights bodies. For example if average person need to drink 4 beers to be drunk, knights would need 8 or more to be drunk. Everything depends on the level of knights. The stronger knight the more resistant he/she is. Mana allows to manipulate the world or to create new things. For example mage could cause tsunami or earthquake, but they can also create water to wash themselves. Other than that, is that knights live longer than mages, because mana itself doesn't enchant body as much as aura.
Cultivation of knights:
To become a knight. Person needs to be able to pull out his/her aura from themselves. If person is able to do that they become apprentice knight. They train their mana by using it, just like muscles. This causes their amount and stability of aura to increase. When someone hit maximum amount of aura they can accumulate they are creating ring around their hearts using their aura. Rings from 1-6 just need training and some talent.
1-3 rings are called junior knights. They gain ability to enchant their bodies with aura.
4-6 rings are called senior knights. They gain ability to cover their weapons with aura.
7 rings are called master knight. They are able to generate weapons made from their aura. To achieve it. Swordsman must understand the weapon. They need to use their understanding of the weapon to create 7th ring.
8 rings are called grandmaster knight. To create 8th ring, they need to understand principles of the weapon. For example for the sword would be it's versatility etc. When they fused it during creating, and succeed. Grandmaster gains ability to use their bodies as a weapon. For example grandmaster knight that is a swordsman, can perform a slicing movement and that cause for things to be sliced. They can do that with everything from hands to feet.
9 rings are called supreme knights. To create 9th ring, they need to become one with the weapon. Grandmasters can use their bodies like weapons, but supreme knights are people who became the weapon. If they want their voice can cut people.
Cultivation of mages:
First someone needs to sense mana and after that they need to absorb it to their body. When they achieve that, they are apprentice mage. To increase their mana they need to meditate, and absorb mana from surrounding. When they achieve maximum amount of mana, apprentice creates a circle on their heart. Circles allows them better control over mana and spells, also increase their mentall capabilities for example thought process, memory etc. just like knights mages circles from 1 to 6 requires hard work and some talent.
1-3 are called junior mages. They are able to cast simple spells, that involves one element for example fireball.
3-6 are called senior mages. They can cast more advanced magic, or have better control over it. For example junior mage can cast fireball, but after sending it flying, he/she can't do anything.
7 circles are called high mage. To achieve that they need to connect to mana and use it as extension of the body. High mage can control very complicated spells that needs several elements, or different forces acting at the same time.
8 circles are called archmage. To achieve that mage needs to connect with mana and create connection. They gain ability to use complex magic, for example teleportation.
9 circles are called supreme mages. They need to create connection with the world itself. Which grants them ability to manipulate the world to some extent. They can use mana in the world to cause tsunami or even earthquake.
Consequences of creating ring or circle:
When someone takes the path of the knight, they lose access to mana. They can still use it, but only to just lit the candle, or make cup of water. The same goes for mages, they lose mostly access to aura. It's possible for them to use aura to increase digestion, or speed up healing process to small extent for example small cut will stop bleeding few minutes earlier than normally.